Stylus pen



FIG. 1 is a front perspective view of a stylus pen, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is another perspective view of the stylus pen shown with an unclaimed electronic device; and,

FIG. 9 is a front view of the stylus pen with the unclaimed electronic device in FIG. 8.

The even-dash broken lines illustrating portions of the stylus pen form no part of the claimed design. 

CLAIM The ornamental design for a stylus pen, as shown and described. 